CN101226357B - Image forming apparatus and image forming method - Google Patents

Image forming apparatus and image forming method Download PDF

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Publication number
CN101226357B
CN101226357B CN200810001006.5A CN200810001006A CN101226357B CN 101226357 B CN101226357 B CN 101226357B CN 200810001006 A CN200810001006 A CN 200810001006A CN 101226357 B CN101226357 B CN 101226357B
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China
Prior art keywords
image
carrier
toner
processing system
intermediate transfer
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CN200810001006.5A
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Chinese (zh)
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CN101226357A (en
Inventor
渡边猛
吉田稔
高桥雅司
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Toshiba Corp
Toshiba TEC Corp
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Toshiba Corp
Toshiba TEC Corp
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0887—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity
    • G03G15/0891—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers
    • G03G15/0893—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers in a closed loop within the sump of the developing device
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • G03G15/0851—Detection or control means for the developer concentration the concentration being measured by electrical means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0877—Arrangements for metering and dispensing developer from a developer cartridge into the development unit
    • G03G15/0879—Arrangements for metering and dispensing developer from a developer cartridge into the development unit for dispensing developer from a developer cartridge not directly attached to the development unit
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
    • G03G15/162—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support details of the the intermediate support, e.g. chemical composition
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0103—Plural electrographic recording members
    • G03G2215/0119—Linear arrangement adjacent plural transfer points
    • G03G2215/0122—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt
    • G03G2215/0125—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted
    • G03G2215/0132—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted vertical medium transport path at the secondary transfer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/06—Developing structures, details
    • G03G2215/0602—Developer
    • G03G2215/0604—Developer solid type
    • G03G2215/0607—Developer solid type two-component
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/06—Developing structures, details
    • G03G2215/066—Toner cartridge or other attachable and detachable container for supplying developer material to replace the used material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/16—Transferring device, details
    • G03G2215/1604—Main transfer electrode
    • G03G2215/1623—Transfer belt

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Color Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

A technology for controlling the generation of damages of a photoconductive surface caused due to the attachment of a carrier to a photoconductor in an image forming apparatus using a two-component developing agent is provided. An image forming apparatus is configured to include an intermediate transfer body having prescribed elasticity on a transfer surface onto which a toner image is transferred; plural image carriers which transfer a toner image onto the transfer surface and which are disposed along a movement direction of the transfer surface of the intermediate transfer body; plural development sections which form toner images having a different color from each other with respect to the plural image carriers by using a two-component developing agent made of a toner and a carrier; and developing agent replenishment sections which replenish a toner and a carrier in the development sections.

Description

Image processing system, image forming method
Technical field
Image quality maintenance technology in the image processing system that the present invention relates to use two-component developer to carry out image formation processing.
Background technology
In the past, as the technology that can obtain the high-quality colour image at a high speed, known have in the image processing system of " quadruple series system (quadruple tandem system) ", by the processing unit arranged along intermediate transfer belt with the toner image of multiple color is overlapping transfer on the intermediate transfer belt after, property is transferred on the paper etc. (one draws together) again.
Use above-mentioned prior art, instability can cause " ghost image " on handling, by carrying out transfer printing on the intermediate transfer belt showing on this stability preferably, can the transfer printing of high image quality ground, afterwards, property ground secondary transfer printing is to final transfer printing things such as paper, so again, can suppress decrease in image quality, improve the versatility of paper simultaneously.
In such image processing system, a lot of occasions are all used improving the favourable binary visualization way of picture quality.In recent years, the more high image quality that develops with this binary is a target, and the carrier particle diameter of use becomes littler.
Such in the device of high image quality, especially very important colour balance when remaining on overlapping colors, under the state beyond the action of image lettering, transfer printing fragmentation pattern picture (patch image) afterwards on intermediate transfer belt, detect the concentration of fragment and reflectivity etc. by being arranged on reflectivity sensor in the device etc., and be worth according to this and adjust image forming conditions, promptly be provided with so-called image quality retentive control mechanism.
As the image forming conditions that changes by image quality retentive control mechanism, the treatment conditions and the Flame Image Process pattern of the toner concentration (T/C) in for example charged bias voltage, developing bias voltage, exposure, the developer etc., make its identical gray-level characteristic etc. by changing these, such condition has a lot, also can use the combination control of a plurality of conditions.
; wherein; for example the toner concentration, particularly visualization way in inner control background compared potential in a big way (the charged current potential of photoreceptor and development current potential poor) and developer is under the situation of binary method, can produce carrier particle easily attached to the problem on the photoreceptor.This means that the particle diameter of carrier is more little to realize that high image quality is a target, the nargin that can change condition just becomes more little.
In addition, high image qualityization only not, for cost degradation and the long lifetime of further considering device, as the live part of photoreceptor, when using the charged device of resistant to pollution brush cheaply, it is distinctive charged inhomogeneous that brush will take place.It is inhomogeneous particularly can to cause photoreceptor to have the strip voltage of the charged direction of expecting that charged current potential is high, is that the brush and sac like material is peculiar, has to make carrier be attached to defective on the photoreceptor in development section easily.
In addition, for example, in case development section place electrified body that the image of the upstream side of quadruple tandem arrangement forms working point (station) attached to photoreceptor one side on because this transfer position can rub between itself and intermediate transfer belt, it is damaged to cause photosensitive surface to have color.Further, when carrier is transferred to intermediate transfer belt on transfer position, first image form the place, working point attached to the carrier on the photoreceptor can arrive second, third, the 4th image forms the transfer printing portion of working point, therefore, the working point of back is just serious to the infringement of photoreceptor more.And photosensitive surface can cut by suppressed by vector, can produce a lot of pitlike depressions, thereby causes image resolution ratio to descend; Further this recess can adhere to the adjuvant of toner or toner, thereby causes the problem of the strip of image and white point etc.Further, can exist for a long time, can cause the minimizing of the carrier amount in the developer because the phenomenon of carrier is adhered on the sensitization side.Thus, developer level also can reduce in the developer, and density unevenness is spared etc. easily when the comprehensive black image of lettering (solid, the lettering zone be a black image entirely).
Promptly, used the colored printing device of the intermediate transfer belt of quadruple series connection, it adopted with the high image quality be target use the binary of granule carrier develop, precision with necessary colour balance of high image quality etc. rises to target, from the drawback of carrier attachment phenomenon, it is unpractical that the toner concentration in background compared potential and the developer is significantly controlled; Because changing (wearing out), environmental change on every side and time can cause the variation of properties of materials, thus also can not carry out the control of treatment conditions very perfectly, thereby, all in all, can not obtain well-content high image quality.And, to realize that cost degradation and long lifetime are target, even adopt the charged materials of brush and sac like, also same problem can take place.
Summary of the invention
The objective of the invention is to, provide a kind of in adopting the image processing system of two-component developer, can suppress to adhere to and the impaired technology of light-sensitive surface that causes by the carrier on the photoreceptor.
In order to solve above-mentioned problem, the image processing system that a first aspect of the present invention is related comprises: the intermediate transfer body has in transfer printing on the transfer surface of toner image and has predetermined elasticity; A plurality of image-carriers are arranged along the moving direction of the transfer surface of described intermediate transfer body, and to described transfer surface transfer printing toner image; A plurality of development sections adopt the two-component developer that is made of toner and carrier, form the toner image of color inequality on each image-carrier of described a plurality of image-carriers; And developer supply portion, to described development section supply toner and carrier, wherein, the hardness of the described transfer surface of described intermediate transfer body is lower than the hardness of described image carrier surface.
In addition, the image processing system that a second aspect of the present invention is related comprises: the intermediate transfer body has in transfer printing on the transfer surface of toner image and has certain elasticity; A plurality of image-carriers are arranged along the moving direction of the transfer surface of described intermediate transfer body, and to this transfer surface transfer printing toner image; A plurality of developing cells adopt the two-component developer that is made of toner and carrier, form the toner image of inequality color on each image-carrier of described a plurality of image-carriers; The developer supply unit is to described developing cell supply toner and carrier.
In addition, image forming method in the related image processing system of a third aspect of the present invention, the a plurality of image-carriers of described image processing system by arranging along the moving direction of the transfer surface with predetermined elasticity of intermediate transfer body, to described transfer surface transfer printing toner image, described image forming method comprises: to a plurality of development section supply toners and carrier, described development section adopts the two-component developer that is made of toner and carrier, and on described a plurality of image-carriers, form the toner image vary in color respectively, wherein, the hardness of the described transfer surface of described intermediate transfer body is lower than the hardness of described image carrier surface.
Description of drawings
Fig. 1 represents the example of formation of the image processing system of embodiments of the invention.
Fig. 2 represent that particle diameter, the carrier of carrier particle adhere to and image overexposure (fog, photographic fog) amount between the figure of experimental result of relation.
Fig. 3 represent that particle diameter, the carrier of carrier particle adhere to and image overexposure amount between the figure of the experimental result that concerns.
Carrier when Fig. 4 represents to change toner concentration adheres to the figure with the overexposure magnitude relation.
Fig. 5 represents the detailed figure of formation of the image processing system of embodiments of the invention.
Fig. 6 represents the detailed figure of formation of the image processing system of embodiments of the invention.
Fig. 7 represents the detailed figure of formation of the image processing system of embodiments of the invention.
Fig. 8 represents the figure that this experimental result is detailed.
Fig. 9 represents to have set between photoreceptor and the intermediate transfer belt figure of the experimental result of velocity contrast.
Figure 10 represents to use brush to replace the figure of the detailed formation of cleaner plate.
Figure 11 represents the key diagram that is suitable for the effect when of the present invention that is formed in shown in Figure 10.
During Figure 12 represents that cleaner-less is handled, adopting corona charging device (corona charger) and adopting under the situation of charged roller the comparing result figure of the image quality decrease level under the inapplicable state of the present invention.
Figure 13 represents that the electro-mechanical part that each image forms in the working point uses the pie graph of brushing the shape material.
Figure 14 represents to use the figure of the experimental result of device shown in Figure 13.
Embodiment
Below, with reference to accompanying drawing embodiments of the invention are described.
Fig. 1 is the example of formation of the image processing system of present embodiment.
As shown in the figure, the image processing system based on present embodiment has adopted as the intermediate transfer mode intermediate transfer body, that used intermediate transfer belt.And the image processing system of present embodiment has four processing unit K～Y such as black, blue-green, magenta, yellow, and these processing units (image formation working point) are the quadruple cascaded structures along the zone face moving direction configuration of intermediate transfer belt.
Detailed formation to each processing unit K～Y describes.Each processing unit K among the present invention～Y, its basic comprising is identical, so at this, be elaborated at the formation of yellow processing unit Y, the detailed description of other processing unit K～M is tired to be stated.
Processing unit Y has the developer (development section) that comprises photoreceptor Y11, charged roller Y12 and developer roll Y14.In addition, integrated at least at least one that has in photoreceptor Y11 and charged roller Y12 and the developer of processing unit Y, and can with image forming device body dismounting freedom.
Photoreceptor Y11 in the present embodiment can adopt OPC (Organophotoreceptor) or amorphous silicon well-known materials such as (a-Si).At this, adopt OPC.
As charged elements, can use corona charging device (scorotron charger) or charged roller.Present embodiment adopts charged roller Y12, by implementing unit 222 by the charged bias voltage of CPU801 control, applies the AC biasing of pp2kv (2kHz) on DC-650v, thus make OPC charged-650v.
Exposer Y13 uses laser instrument or LED as light source.In exposer Y13, use for example semiconductor laser of wavelength 700nm, allow the photoreceptor current potential of exposed portion descend.The exposure that partly decays that the exposure of this moment is set photoreceptor for to its four times for well.
In the image processing system of present embodiment, at least adopt the binary visualization way of having used the two-component developer that constitutes by toner and carrier, in the napping that includes the last formation of the developer roll of permanent magnet (magnetic roller) Y14 carrier, apply DC biasing or DC+AC biasing (bias voltage) etc. by implement unit 223 by the developing bias voltage of CPU801 control between itself and the photosensitive surface, thereby develop.
As an example of the applying method of developing bias voltage, generally be exemplified as stack AC pp2kv (6kHz) on DC-500v.In order to realize high image quality, people make many efforts, and comprising: adopt that on the AC bias voltage square wave and change Duty compare etc.
Under these conditions, if when exposure was 1.3 times of left and right sides of the exposure that partly decays of photoreceptor Y11, the photoreceptor voltage after the exposure was-250v about, poor (background contrast) between the photoreceptor current potential of non-image part and the development bias voltage is 150v.At this moment, development bias voltage (developing bias) is 250v with poor (contrast of developing) of exposure afterpotential.
Then, the toner image to photoreceptor of developing with this understanding is transferred on the intermediate transfer belt 501 in transfer printing portion.Intermediate transfer belt 501 is constituted by the resin of 50～2000 μ m or rubber or their compound by having semiconduction, thickness.Not relative side contacts in transfer member by will having applied bias voltage and the intermediate transfer belt 501 with photoreceptor Y11, the transfer printing clamping face that between photoreceptor Y11 and intermediate transfer belt 501, is contacting with and periphery, applied transfer electric field.
In the present embodiment, making the back side contact of intermediate transfer belt 501 adopt volume resistance is the transfer printing roller bearing Y15 of the conductive sponge body of 10e5～10e8 Ω cm, apply 224 by transfer printing bias voltage and apply DC300v～3000v, the toner image on the photoreceptor is transferred on the intermediate transfer belt 501 by CPU801 control.Then, use such processing unit K～Y, on intermediate transfer belt 501, repeat transfer printing, and then, form the figure of full color, afterwards, at secondary transfer printing position T2, be transferred on the paper that is transferred medium, and image added heat fixation, thereby form final image by not shown fixator.
In such formation, the intermediate transfer body is one, has two transfer step, once be from photoreceptor Y11 to intermediate transfer belt 501 transfer printing toner images, be called clamper's step for the first time; By the transfer printing first time, the toner image of 4 color separations is superimposed be transferred on the intermediate transfer belt 501 after, be transferred to once on the paper etc., be referred to as transfer step for the second time.
In addition, directly carry out the direct transfer printing mode (not being that intermediate transfer body but paper are carried transfer belt) of the overlapping transfer printing of a plurality of colors, transport the mode of toner images etc. by a plurality of intermediate transfer body transfer printings, motion is also arranged to paper from photoreceptor., directly to the repetition transfer printing instability of paper, and transfer step must follow image quality reduction, therefore, consider from reduce the transfer printing number of times as far as possible, and be in the device of purpose with the high image quality, adopt an above-mentioned intermediate transfer body for well.
In addition, also be provided with cleaning unit, it removes the toner that remains on the photoreceptor after each image forms the working point transfer printing, further can implement if desired to remove electric treatment, and then carry out charged step.
Next, the image quality retentive control at the image processing system of present embodiment describes.
Reflectivity sensor 221 is configured to read the zone face of intermediate transfer belt 501, by CPU801 from photoreceptor Y11 on intermediate transfer belt 501 transfer printing predetermined fragmentation pattern picture (predetermined image) afterwards, the reflectivity that each image forms the color of the formed fragmentation pattern picture in working point is detected by reflectivity sensor 221.The function that the CPU801 here and each image form the working point is equivalent to predetermined image formation portion.
CPU801 obtains the reflectivity of the detected fragmentation pattern picture that comes of reflectivity sensor 221.The function of the CPU801 of this moment is equivalent to the transition information obtaining section or transition information obtains the unit.
Many times, the image quality retentive control is divided into: allow the highdensity image section of comprehensive black image etc. continue the control that keeps certain; Under the state of the image quality that keeps the video high density part, the control of the low-density image section of trickle adjustment.Detection data when carrying out these image quality retentive controls, reflectivity sensor 221 obtain and the control of various voltages is finished by CPU801.
As the image quality adjustment method of the highdensity image section that comprises comprehensive black image, known have a various methodologies.The development amount of highdensity image section can and be developed to control recently by the carried charge of toner basically.For example, the exposure that partly decays that is set at photoreceptor of exposure about generally adopts following method more than 2 times the time.
For example, the electrified voltage of photoreceptor Y11 is-450v that developing bias voltage is-300v that exposure back voltage is-50v that at this moment, because exposure is bigger, even change electrified voltage, exposure back voltage also can be fixed on-50v.Therefore, allow charged bias voltage and developing bias voltage increase simultaneously or to reduce, adjust to allow the background compared potential remain certain development contrast.For example, under ambient temperature and moisture, the carried charge of toner is about-30 μ C/g, and under these conditions, the development amount of black image is 0.5mg/cm comprehensively 2About, final image density is about 1.5 suitable substantially.
, in the low temperature and low humidity environment, for example, when the carried charge of toner rises to-40 μ C/g left and right sides, be that 0.3mg/cm can only develop under the 250v in the contrast of developing 2About, image density can only reach about 1.1.Therefore, by detect the fragmentation pattern picture that is transferred on the intermediate transfer belt 501 by reflectivity sensor 221, can adjust electrified voltage and be-600v, developing bias voltage is-450v, promptly be offset 150v respectively,, also can obtain enough development amounts even so that the carried charge of toner is higher.
In addition,, the method for adjusting the toner concentration in the developer is arranged, at this moment, can realize by the surplus supply toner when wishing to increase the development amount as the example of the carried charge of controlling toner.Usually toner concentration is 7～9%, and when hope increased the development amount, the supply toner made it reach 10% concentration, thereby even under the low temperature and low humidity environment, also can reduce the carried charge of toner, obtains suitable image color.
In addition, when the setting of exposure smaller (exposure that partly decays 2 times less than), in case the control electrified voltage, therefore voltage also change thereupon in exposure back mainly is that the control light quantity is adjusted the development amount.For example, electrified voltage is set at-750v, and developing bias voltage is set at-600v, exposure back voltage is set at-350v, in the case, and during the environment of same low temperature and low humidity, make the exposure afterpotential be-200v by increasing light quantity, enlarge the development contrast with this way.
In addition, even in such setting, the method for adjusting the concentration of the toner in the developer also is effective certainly.
As previously discussed, after the image quality adjustment of having finished the high-density images part that comprises comprehensive black image, will carry out the fine setting of image quality of the image section of low concentration, when light quantity setting is bigger situation, can change light quantity or charged current potential (background contrast) goes to realize control by CPU801; When light quantity setting is less situation, can cause the high-density images part to change thereupon, therefore, need to adjust the background compared potential if change light quantity.
, if inadvertently adjust the background compared potential, can cause adhering to carrier in photoreceptor one side development section, promptly so-called " carrier adheres to " problem takes place.
This carrier is many more when big more attached to the background compared potential.On the other hand, background compared potential is too small, can enlarge in vain, so, can cause background compared potential's setting range in very narrow nargin (margin), to carry out.
(1) for a long time in development treatment the carrier in the developer become deterioration, and under the less situation of the particle diameter of the carrier particle of (2) developer use, this background compared potential's nargin can be narrower, becomes substantially and can't adjust.
Fig. 2 and Fig. 3 be the particle diameter of carrier particle is described and carrier adheres to and image overexposure amount between the experimental result that concerns.
" overexposure amount (fog amount) " rapping photosensitive surface with mending tape (mendingtape) under the condition in vain, use X-rite (registered trademark) to detect reflectivity with the state that is attached on the blank sheet of paper, and then try to achieve and the reflectivity when not rapping photosensitive surface poor.And generally on the image and on the device, no problem scope is below 2%.
In addition, " carrier adhesion amount (carrier attachment amount) " is same as described above, raps after the photosensitive surface with mending tape, and belt is bonded on the blank sheet of paper, calculates the quantity of the carrier (carrier) that adheres on the belt.The area of belt is 60cm 2If the carrier number that adheres in this area is 5 and does not just have too big problem in the general image processing system when following that it is few more more good to say nothing of.Particle diameter about carrier particle, use diffraction, the diffuse transmission type particle size distribution device (LA-950, Horiba company makes) of laser, the scope of 0.1～200 μ m is divided into 32 five equilibriums, measure, and 50% the mean grain size of getting volume distributed median is as mean grain size.
In the experiment of the data that obtain Fig. 2, used the relatively carrier of new state, the particle diameter of carrier is more little, can suppress the permissible range (margin) that overexposure amount and carrier be attached to the background compared potential of proper level and just become narrow more.Fig. 3 is the result who has carried out 10000 carriers after the lettering experiment.Based on this, if particle diameter is the carrier of 40 μ m, background compared potential's permissible range also has certain amplitude, if 35 μ m if the fixed background compared potential does not use, can cause the generation problem.
Like this, the not background compared potential just that the setting range that carrier is adhered to exerts an influence also is same during toner concentration (T/C) in the bigger change developer.And " T/C " herein means " all amounts of tone dosage/2 component developers ".
Carrier when Fig. 4 represents that toner concentration changes adhere to and overexposure between relation.After 10000 letterings of carrier use, still the carrier particle diameter is more little, and the nargin that carrier adheres to is narrow more, when particle diameter is the carrier of 35 μ m, in case toner concentration is also being changed on a large scale than 6～9%, and the setting range that then can cause overexposure and carrier to adhere to disappears.And, in case taking place, adheres in above carrier, as previously mentioned, the photoreceptor infringement will take place, and the image problem that the minimizing by the developer in the developer causes takes place.
Therefore, in the image processing system of present embodiment,, adopted and satisfied structure as follows at 2 as Fig. 5～shown in Figure 7.
(1) even adhere to the infringement that does not also produce photoreceptor for carrier takes place, give in the intermediate transfer belt, have the transfer surface of toner image to have certain elasticity from the photoreceptor transfer printing.
(2) even adhere to for carrier takes place, the developer in the developer does not reduce yet, and adopts the mode of supplying with two-component developer step by step in developer.
About the formation of the intermediate transfer belt of (1), can stack further also can consider the release of superficial layer etc. on as the resin bed of bottom as the rubber layer of elastic layer, superficial layer is set.
Specifically, the condition of each layer of formation intermediate transfer belt is as described below.
Bottom (substrate layer): thickness is 50～150 μ m, can use known material, such as the resin of polyamide etc.Volume resistance with 10e6～10e12 Ω cm for well.
Elastic layer: thickness is 2～50 μ m, and urethane rubber, silicon rubber, acrylic rubber (acrylic rubber) and NBR etc. can certainly use foaming body.Preferred hardness is 20～70, and volume resistance is 10e6～10e12 Ω cm.
Superficial layer: thickness is 2～50 μ m, sprays the coating of fluorocarbon (fluorocarbon) class or silicones class, perhaps fires the resin (PFA) of fluorocarbon class.Preferred volume resistance is 10e8～10e14 Ω cm.
In addition, when allowing some color displacements, also can be with the elastic layer of rubber etc. as bottom, superficial layer is set and with it as release layer.At this moment, can adopt above-mentioned bottom structure in addition.In addition, when the zone face of intermediate transfer belt clips carrier particle between this face and light-sensitive surface, need be designed to have the elasticity of not bringing injury to photosensitive surface.Like this, set the hardness of the transfer surface of intermediate transfer body for the predetermined hardness low than the hardness of image loading end, promptly set for, even carrier particle is attached on the image loading end, also be unlikely to the such hardness of damage image loading end, thereby can suppress to adhere to caused impaired generation by carrier to the elastic carrier face.
Next,, adhere to,, be accompanied by lettering action etc., supply with the developer that comprises carrier slowly from toner cartridge 226 in order not reduce the developer level in the developer even carrier takes place about the formation of the developer of (2).In addition, the formation of the visualization way shown in the present embodiment is an example, is not the concrete formation that the present invention just is defined in the visualization way in the present embodiment.
The example of developer such as Fig. 6 and shown in Figure 7.Developer (for example has toner concentration (T/C) detecting device, the magnetic susceptibility sensor) 700, also can be provided with from mechanism's (for example, valve) of inlet filling developer, so that toner concentration is predefined toner concentration or the toner concentration that determined by the image quality retentive control.In toner concentration detector 700, can have the function of the change degree (the perhaps related information of degree) of the charged characteristic that detects the two-component developer in the developer.At this moment, CPU801 obtains toner concentration detector 700 data that detect, and with its as the associated information of the degree of the change of the charged characteristic of 2 component developers (this moment CPU801 be equivalent to the transition information obtaining section, transition information obtains the unit).
In addition, the developer of Shi Yonging has the escape hole 406 of developer in the present embodiment, from discharging developer here automatically slowly, delivers to useless toner cartridge.Control about discharge rate, for example as shown in Figure 6 and Figure 7, by can control the action of discharge as rotation of the spiral 701 of the deliverying unit of developer etc., also can be as shown in Figure 5, after the developer level in the developer is increased to certain height, next door or hole 406 etc. can be set on the developer sidewall, developer can spill into wherein, promptly so-called (overflows) mode of overflowing.
The supply of developer is a small amount of carrier that is pre-mixed toner in toner cartridge 226, according to the consumption of toner (information that obtains according to the transition information obtaining section), by by the developer supply mechanism (developer supply portion) of CPU801 control supply carrier slightly at every turn, also can control carrier and toner supply respectively and give developer.Any mode no matter, the unnecessary developer that puts in can be discharged by spiral discharge modes such as (screw rods) or the mode of overflowing, and therefore, can not cause the developer in the developer too much or very few, thereby remain on a certain amount of on.Therefore, adhere to, also be bound to carry out above-mentioned supply or discharge even carrier takes place, so, can the developer level in the developer not exerted an influence.Promptly so-called visualization way of in the supply of carrying out developer (toner and carrier), discharging.
Like this, CPU801 and developer supply mechanism, when the toner that is consumed at developing carried out toner supply, the supply carrier was replaced the carrier in the developer at every turn slightly, thus the change of inhibition zone electrical characteristics.Like this, CPU801 (being equivalent to developer supply portion, developer supply unit) keeps the charged characteristic of the two-component developer in the developer at certain state based on developer supply discharge mode.
Next, the affirmation experiment at the effect of said structure describes.It is two kinds of 35 μ m and 40 μ m that the particle diameter of carrier particle is adopted in this affirmation experiment.
In addition, photoreceptor adopt the exposure that partly decays be 0.3nj/cm2, size is the OPC of PHTHALOCYANINE GREEN 7 (phthalocyanine) class of φ 30mm.
Carrier adheres to the very big influence that development can be subjected to the toner concentration in carrier particle diameter and background compared potential and the developer.The mensuration of " carrier adhesion amount " and " overexposure amount " is undertaken by the method for the working service band that illustrated.In common image processing system, 5/60cm during the permissible level of carrier adhesion amount 2And below, the overexposure amount preferably 2% and below.The carrier of 35 μ m particle diameters under the toner concentration (T/C=7～9%) of standard, background compared potential is 140v when following, the carrier adhesion amount is a permissible level; When the carrier of 40 μ m particle diameters, be below the 155v.In addition, whichsoever, in case, will cause white ground or overexposure to surpass 2% (with reference to Fig. 2) less than 120v.
In experiment, the electrified voltage of photoreceptor is set at-700v, adheres to for carrier does not take place, and background compared potential has set 125v for, and therefore, developing bias voltage is-575v.At this moment,, under the ambient temperature and moisture environment be-325v, regulate exposure, thereby voltage be-250v after the exposure of adjustment photoreceptor in order to obtain the development contrast of desirable comprehensive black concentration (ID=1.5).And at this moment, the hue area rate is that 64/255 o'clock image color (ID) is 0.2.
In above-mentioned state, when test unit was placed the low temperature and low humidity environment, in order to obtain desirable comprehensive black concentration (solid concentration), the contrast of developing was necessary to set for-325v～400v.Therefore, exposure is set at strong than ambient temperature and moisture, and the afterpotential that will expose be set at-during the 175v situation, can keep comprehensive black concentration ID=1.5.This moment, the GTG area occupation ratio is that 64/255 o'clock image color (ID) has become 0.25.Therefore, when making the background compared potential reach 140v by CPU801 accommodation zone electric potential, 64,/25 5 image color (ID) becomes 0.2, thereby the image color of the image section of low concentration is identical can be with the ambient temperature and moisture environment time.
, this background compared potential is for the condition of 140v is when adopting 35 μ m carriers, the value when becoming the nargin limit saturated of carrier adhesion amount.But this is the state of new product carrier, and for example, carrier commonly used shown in Figure 3 can surpass permissible range, and carrier adheres to and reaches 15/60cm 2
In addition, when particle diameter is the carrier of 40 μ m, under above-mentioned identical condition, though entered permissible level, also entered carrier and adhered to the zone of increase, like this, mainly going to adjust under the method for low concentration portion by adjusting the background compared potential, the problem that carrier adheres to can easier generation., shown in above-mentioned example,, in the adjustment of the image section of low concentration, can not use the parameter that is called light quantity adjusting under the method for comprehensive black concentration by the control light quantity.In addition, as the adjustment unit of the image section of low concentration, though the method for control image model etc. is also arranged, for obtain not take place the GTG jump, high resolution image, be necessary to regulate the background compared potential.
In experiment, by a series of like this action, with the fragment lettering of the fragment of high concentration and low concentration on the intermediate transfer body, use the reflectivity sensor again, again by CPU801 (being equivalent to the potential difference (PD) control part) at comprehensive black concentration adjustment exposure, regulate the background compared potential (based on the obtained information of transition information obtaining section at the image section of low concentration, the charged current potential of the image loading end of control chart image carrier and the difference that is applied between the current potential on the development section reach predetermined potential difference (PD)), such mode, (21 ℃ 50%) lettering is 20000 under the ambient temperature and moisture environment, (30 ℃ 80%) following lettering is 10000 under the many wet environments of high temperature, under the low temperature and low humidity environment after 10000 of (10 ℃ 20%) letterings, to the even situations such as (ID's are inhomogeneous) of the density unevenness of the image of Neutral colour (halftone) and even whether generation of density unevenness of the image during 3 of continuous letterings of black image comprehensively, carried out Visual Confirmation.
Specifically, in half tone image, when white point and strip took place, it is higher that photosensitive surface is subjected to the possibility of the damage that carrier causes; When comprehensively black image generation density unevenness is even, mean that then the developer level in the developer is less, cause the deterioration that becomes of the following of comprehensive black image.
In half tone image, visual valuation uses " zero △ * ", in comprehensive black image, 56 in image use Macbeth reflection of the concentration are measured, and image color is zero in 1.4～1.6 scopes, image color is 1.35 to be △ when above, be lower than at 1.35 o'clock for *.
In addition, when adjusting comprehensive black concentration, same as described abovely confirm, with the influence of investigation image quality by change toner concentration rather than exposure.Original state in above-mentioned condition, exposure is in each environment of fixed value, can obtain the toner concentration of desired comprehensive black concentration (ID=1.5), is 9% in the low temperature and low humidity environment, being 7.5% in the ambient temperature and moisture environment, is 6% in the many wet environments of high temperature.Just, these are values of the developer of original state, in fact detect the fragment concentration on the intermediate transfer belt, use the auto tone sensor (automatic toner sensor) in the developer, automatically provide feedback and adjust.
It is identical that all images of the image processing system that is set in the quadruple series system of these conditions forms among the K～Y of working point.In addition, identical color toner is used in each working point, and the lettering rate is 6% in each working point, and not overlapping with these is condition, forms image and carries out the continuous lettering of A4 size.The evaluation of image is carried out respectively at the monochrome image place of the second and the 4th working point.
Fig. 8 has described above-mentioned experimental result.In the figure, " the present invention " means, when using superficial layer rubber-like intermediate transfer belt, adopts developer supply to discharge formation visualization way, present embodiment and experimentize." non-the present invention " means that use does not have the intermediate transfer belt of elasticity (for example, the polyimide of individual layer constitutes), and do not adopt developer supply to discharge visualization way.In addition, taken place inhomogeneously when so-called " HT is inhomogeneous " means the lettering half tone image, taken place inhomogeneous comprehensively when " black inhomogeneous " means the comprehensive black image of lettering.
At first, adjusting by the background compared with control in the image section method of low concentration, when using the carrier of 35 μ m small particle diameter, in inapplicable example of the present invention, after 20000 letterings, strip and white point have all taken place in second working point (blue-green), the 4th working point (yellow) when half tone image, and, when comprehensive black image, it is even that density unevenness has also taken place.On the other hand, in the formation of the image processing system of present embodiment, even after 40000 of the letterings, whichsoever image forms the working point and is also all keeping good image quality.
In addition, when adjusting the high-density images part with toner concentration in the developer rather than exposure, because the image section of low concentration is adjusted with exposure, so, background compared potential does not change, do not use when of the present invention, it is bad to produce image when 30000 of place, second working point letterings, produces image bad (NG) when 20000 of place, the 4th working point letterings.
Like this, the image quality aggravation problem at the 4th working point place intensify be because, offside image in the downstream forms the working point, form the cause of the carrier of working point by the probability increase of intermediate transfer belt conveying than the image that is arranged in upstream side, thereby as can be known, in the processing of the intermediate transfer belt that quadruple is connected, the present invention is crucial.In this experiment, in case adopt the present invention, be also can not have problems really to 40000.
On the other hand, even when adopting mean grain size to be the situation of carrier of 40 μ m, tendency also is same, does contrast with the situation of the carrier that adopts 35 μ m particle diameters, can obtain good picture quality level.
Next, regulating on the basis of high concentration image section with exposure, the image section with the background compared potential regulates low concentration in this combination, is provided with velocity contrast and tests between photoreceptor and intermediate transfer belt.Fast about 1% results that compare of speed of setting photoreceptor as shown in Figure 9.This experiment is under the ambient temperature and moisture environment, per 10000 are carried out an image affirmation, to confirm that altogether 50000 is termination, find, the circumferential speed of photoreceptor than the situation of the circumferential speed of intermediate transfer belt fast 1% and unhappy situation in, and the situation of setting speed difference, in existing formation, be easy to generate inhomogeneous (white point and the strip) of Neutral colour; In the image processing system of present embodiment, when arriving 50000, can not have problems fully yet.
Known have in transfer printing portion, and 0 velocity contrast to a few percent is set between photosensitive surface and intermediate transfer belt, can improve transfer efficiency, and it also is possible further obtaining high image quality; In common having the carrier attachment issue takes place easily on the flexible intermediate transfer belt, owing to velocity contrast can rub with transfer printing portion, so cause the infringement of photoreceptor more serious.For this,, can reduce residual transfer printing amount if the formation of present embodiment makes the infringement that velocity contrast also can reduce photoreceptor is set.
Further, at the situation that the present invention is used in cleaner-less, carried out experimental verification.
This experimental conditions as shown in figure 10, is omitted the clearer that each image forms the photoreceptor in the working point, fixing strip brush K19～Y19 is set, and applies-400v.Brush K19～Y19 need fiber directly be 1～10 minute Tekes (dtex) fiber.In this experiment, adopted the brush of the fiber nylon system directly of 4 Tekes.And about the resistance value of brush, for well, the resistance value of 10e7 Ω is adopted in this experiment with 10e4～10e10 Ω.In this experiment, the difference of the circumferential speed of photoreceptor 11 and intermediate transfer belt 501 is made as 0 substantially, uses the method identical with Fig. 9 to compare.Its result as shown in figure 11, in case do not use the present invention, also earlier, can produce white strip and white point in the half tone image when having clearer, and place, the 4th working point is more Zao than the image quality aggravation of second working point.Here, use when of the present invention, after 50000 letterings, problem does not take place yet.
In the processing of cleaner-less, because there is not special-purpose clearer, can envision, the possibility that rests on for a long time on the photoreceptor 11 attached to the carrier on the photoreceptor 11 is very high, and, by intermediate transfer belt 501, the possibility that the image of level formed on the working point after carrier particle was moved to is also very high.The result is very disadvantageous processing concerning the carrier attachment issue, yet the present invention but is very effective.
In the processing of cleaner-less, special-purpose clearer is not set, can be by the electric recovery of developer, therefore, the reduction of photoreceptor tails off, and its result can envision the long lifetime that can realize photoreceptor.But, along with adhering to, carrier can on photoreceptor, formation cave in, and conversely, than using cleaner plate to carry out the bigger mode that homogeneous is cut down, the easier generation to image damaged, and the result is exactly a lifetime.Adopt the present invention, can allow and not cave on the photoreceptor, thereby, cleaner-less original, the photoreceptor reduction is few and the effect of photoreceptor long lifetime can normally be brought into play.And, very micro-by the residual transfer printing carrier that aforesaid velocity contrast causes, so, therefore can keep high image quality long-term and stably even when cleaner-less is handled, also can obtain high image quality.
In addition, when such cleaner-less was handled, the noncontact parts by corona charging device etc. carried out the charged of photoreceptor and the contact component by charged roller etc. and carry out in photoreceptor charged, and validity of the present invention changes.
When the disposition of cleaner-less, because there is not cleaner plate, when not being transferred attached to the carrier on the photoreceptor, it can enter between charged materials and the photoreceptor.Therefore,, compare when charged with corona charging device even on charged roller, apply the AC bias voltage, the forfeiture easily of charged stability, the result causes the electrified voltage instability.Thereby cause the background compared potential further to change, and then cause carrier to adhere to easier generation, cause carrier to adhere to surge.That is, use under contact electrification mode and the employing cleaner-less disposition, validity of the present invention becomes higher.
When selecting corona charging device to be the charged materials situation when in fact cleaner-less is handled, when setting bias voltage for DC-750v+AC pp2kv situation when utilizing charged roller, and do not use the comparing result of the deterioration level of the image under the state of the present invention respectively, as shown in figure 12.
As shown in the drawing, form in the processing at the existing image that clearer is arranged, because the difference of the white strip of the half tone image that the difference of charged elements causes, level of fish eyes and not obvious.Relative therewith, when cleaner-less was handled, the image quality when adopting charged roller obviously worsened, and level is better when adopting corona charging.
On the other hand, even when adopting corona charging, in the image processing system of present embodiment, after 50000 letterings problem does not take place yet, as can be known, the cleaner-less that the present invention has applied the charged roller of AC bias voltage in employing is effective when handling.
In addition, the invention is not restricted to cleaner-less and handle, also is very effective for take place on local charged inhomogeneous this problem easily at former electro-mechanical part.For example, as shown in figure 13, the electro-mechanical part in each image formation working point adopts the structure of the material K18～Y18 of brush and sac like.These brush and sac like K18～Y18 is applied in predetermined bias by charged bias voltage applying unit 222K～222Y, thereby makes the light-sensitive surface of photoreceptor charged.
It is charged inhomogeneous that intrinsic strip can take place the charged device of brush, and this charged inhomogeneous part exceeds more than tens of v than desired electrified voltage, and therefore, when particularly making up with the binary visualization way, the carrier that is easy to generate on the photoreceptor adheres to.
Figure 14 has described the experimental result of apparatus structure shown in Figure 13.In this experiment, brush is that nylon system, the fiber number of φ 14mm is that 4Dtex, resistance are 10e6 Ω, in the speed rotation of with direction with 2 times, and applies the DC bias voltage with respect to the contact site of photoreceptor.In addition, do not carry out background compared potential's control, do not change toner concentration, and implement life experiment.About the image color change of Neutral colour, do not control especially.
Its result, when electro-mechanical part adopts corona charging (noncontact is charged), even do not use the present invention, as mentioned above, because background compared potential and toner concentration are maintained fixed, so also problem can not take place after 50000 letterings; When adopting the brush roller as charged device, it is even that white strip and density unevenness will take place in the time of 5000, but also be that the image quality that the 4th image formation working point is located worsens more.
On the other hand, in the image processing system of present embodiment, the second, the 4th image forms the working point can problem not take place in the time of 50000, and as can be known, the present invention produces effect to the maintenance of image quality very much.
The above, the intermediate transfer belt by employing has resilient surface layer even how much adhere to some carriers at the light-sensitive surface of photoreceptor, also can be absorbed by resilient surface layer, thereby can alleviate the infringement (generation of the depression of cratering etc.) to photoreceptor.In addition, surface by giving intermediate transfer belt is with elasticity, and the toner image secondary transfer printing on the intermediate transfer belt on having concavo-convex paper the time, is being compared with the band that resin strip etc. is hard, following is better, also can realize 2 transfer printings of high image quality for coarse paper.
, in case developer level begins to reduce, just can not chase after from comprehensive black image etc., tone dosage will sharply reduce, and the image quality retentive control becomes impossible.It is impossible that such image quality retentive control becomes, and can cause tone dosage to reduce more this moment, adheres to and can significantly increase to the carrier of photoreceptor, and then can cause the resilient surface layer institute of intermediate transfer belt can not total number to absorb concavo-convex quantity carrier understanding attached thereto.
Therefore, as shown in this embodiment, have in the image processing system of intermediate transfer belt of resilient surface layer in employing, so-called by adopting " developer supply discharge visualization way ", change corresponding to developer level makes the charged characteristic of developer keep certain, thereby the carrier on the inhibition photoreceptor adheres to, and on the result, can suppress to adhere to the carrier of photoreceptor the generation of the infringement that is caused.
Particularly for high image quality adopts the granule carrier, and change treatment conditions, carry out image quality when keeping action, attached to the light-sensitive surface of photoreceptor, tone dosage is change easily also, so the effect of present embodiment is big especially easily for carrier.
So, present embodiment is an important topic for adopting granule carrier and the retentive control of high precision image quality, being the image processing system of target and the image processing system that adopts granule carrier and contact electrification material to realize high image quality.The drawback of adhering at the carrier on the photoreceptor in the development section, proposition is discharged visualization way with resilient intermediate transfer belt and developer supply and is combined as countermeasure, based on this, even provide on every side environmental change in long-time, can obtain the image processing system of the full-color image of high image quality.
The above, 4 heavily connecting in the image processing system of intermediate transfer belt mode of adopting the binary visualization way, give with intermediate transfer belt with elasticity, and discharge developer slowly from developer.Using such structure, is target with the high image quality, by the toner concentration in control background compared potential and the developer, even photosensitive surface adheres to carrier, can not produce infringement, further to photoreceptor yet, because the developer level in the developer does not reduce, so can keep high image quality for a long time.The present invention is particularly when the granule carrier that adopts mean grain size below 35 μ m, and is perhaps, during with the cleaner-less treatment combination, more effective.
In addition, even form in the device at the coloured image that adopts the binary development with the charged device of brush, the present invention also is effective.By making up these functions, can provide coloured image small-sized, high image quality to form device.
Present embodiment is that to be used to implement function of the present invention be that example is illustrated to record in advance in device inside, but be not limited thereto, also same function can be downloaded to the device from network, perhaps from the recording medium that has write down said function, install in this function auto levelizer.As recording medium, so long as can store the CD-ROM supervisor and install readable recording medium, its concrete form needn't limit.And by installing or download the function that obtains so in advance, OS (Opration System, operating system) co-operation that can be inner with device realizes function.
With specific embodiment the present invention being had been described in detail, only otherwise break away from spirit of the present invention and scope, can obtain various variations and distortion, all is conspicuous to one skilled in the art.
According to aforesaid the present invention, in the image processing system that has used two-component developer, provide the carrier that suppresses to photoreceptor to adhere to and the impaired technology of light-sensitive surface that causes.

Claims (11)

1. image processing system comprises:
The intermediate transfer body has in transfer printing on the transfer surface of toner image and has predetermined elasticity;
A plurality of image-carriers are arranged along the moving direction of the transfer surface of described intermediate transfer body, and to described transfer surface transfer printing toner image;
A plurality of development sections adopt the two-component developer that is made of toner and carrier, form the toner image of color inequality on each image-carrier of described a plurality of image-carriers; And
Developer supply portion, to described development section supply toner and carrier,
Wherein, the hardness of the described transfer surface of described intermediate transfer body is lower than the hardness of described image carrier surface.
2. image processing system according to claim 1 also comprises:
Predetermined image formation portion forms predetermined picture by described development section on the image loading end of described image-carrier; And
The transition information obtaining section obtains the related information of lettering state of the formed predetermined image of described predetermined image formation portion,
Described developer supply portion is according to by the obtained information of described transition information obtaining section, to described development section supply toner and carrier.
3. image processing system according to claim 1 also comprises:
The transition information obtaining section obtains the related information of change degree of the charged characteristic of the two-component developer in the described development section; And
The potential difference (PD) control part based on by the obtained information of described transition information obtaining section, is controlled, so that the charged current potential of the image loading end of described image-carrier and the difference that is applied between the current potential on the described development section are predetermined voltage difference,
Described developer supply portion is according to the obtained information of described transition information obtaining section, to described development section supply toner and carrier.
4. image processing system according to claim 1, wherein, the electric recovery of described a plurality of development sections remains in the toner on the described image-carrier.
5. image processing system according to claim 1, wherein, the mean grain size of the employed carrier particle of described development section is below the 35 μ m.
6. image processing system according to claim 1, wherein, rotation drives described intermediate transfer body, so that the image loading end of the described relatively image-carrier of the transfer surface of described intermediate transfer body has predetermined velocity contrast.
7. image processing system according to claim 1, wherein,
The transfer surface of described intermediate transfer body when clamping has carrier particle between the image loading end of this transfer surface and described image-carrier, has the elasticity that does not make the described image loading end extent of damage.
8. image processing system according to claim 1 wherein, also comprises:
Charged roller applies predetermined bias, makes the image loading end of described image-carrier charged.
9. image processing system according to claim 1 wherein, also comprises:
Charged brush applies predetermined bias, makes the image loading end of described image-carrier charged.
10. the image forming method of an image processing system, the a plurality of image-carriers of described image processing system by arranging along the moving direction of the transfer surface with predetermined elasticity of intermediate transfer body, to described transfer surface transfer printing toner image, described image forming method comprises:
To a plurality of development section supply toners and carrier, described development section adopts the two-component developer that is made of toner and carrier, and forms the toner image that varies in color on each image-carrier of described a plurality of image-carriers,
Wherein, the hardness of the described transfer surface of described intermediate transfer body is lower than the hardness of described image carrier surface.
11. image forming method according to claim 10, wherein,
On the image loading end of described image-carrier, form specified image by described development section,
Obtain the information relevant with the lettering state of the described specified image that forms,
According to the described information that obtains, to described development section supply toner and carrier.
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JP4655696B2 (en) * 2005-03-09 2011-03-23 富士ゼロックス株式会社 Image forming apparatus
US7266332B2 (en) 2005-03-17 2007-09-04 Kabushiki Kaisha Toshiba Image forming apparatus for recycling toner
US7493066B2 (en) * 2005-10-25 2009-02-17 Seiko Epson Corporation Developing device
US7590368B2 (en) * 2005-11-28 2009-09-15 Seiko Epson Corporation Image forming apparatus and method of cleaning intermediate transfer belt

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US8116665B2 (en) 2012-02-14
JP2008170955A (en) 2008-07-24
US20120107019A1 (en) 2012-05-03
CN101226357A (en) 2008-07-23
US20110069996A1 (en) 2011-03-24
US20080166143A1 (en) 2008-07-10

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